This nema 23 stepper motor with step angle 1.8deg and size 57x57x114mm. It has 8 wires, which have three connection options: Unipolar or Bipolar(Serial) or Bipolar(Parallel), you can choose any type as you wish. It's houlding torque reach 1.7Nm(240.7oz.in) with unipolar connection and 2.5Nm(354oz.in) with bipolar connection. A rear shaft can mount encoder, hand wheel or equals.